Our expert says:
I thought I smelled fumes ! Really, it does sound daft and rude of the mom, and remarkably insensitive and thoughtless. It cannot be that this ex has no other alternatives on earth but this. Sounds like you are and will be handling this like an adult --- but maybe he and you should talk with his mom about the importance of making sure that this arrangement is brief and not long-lasting.
And maybe refusing to accept tonight's invitation will make a useful initial point. I lik Buzz's idea of inviting MiL to your place, instead.
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